Sky wire is a term that typically refers to a cable used for telecommunications that is suspended high up in the air, usually between two points. There are a few synonyms that can be used to describe this type of cable, including aerial wire, overhead cable, and high line. These terms all describe the same type of cable and are often used interchangeably depending on the context. Aerial wire is perhaps the most commonly used synonym, as it is the most descriptive and straightforward. Overhead cable and high line are also commonly used in engineering and utility contexts, but may not be as familiar to the general public.